<h3>描述</h3>
<p>测试suggestion接口为null、undefined、空数据时，组件功能是否正常</p>
<h3>示例</h3>
<h4>1.undefined:</h4>
<br />
<p>选中项： {{selected | json}}</p>
<ti-tags-input style="width: 500px" [id]="id" [suggestions]="undefined" [(ngModel)]="selected"></ti-tags-input>
<br /><br />
<h4>2.null:</h4>
<br />
<p>选中项： {{selected | json}}</p>
<ti-tags-input style="width: 500px" [id]="id" [suggestions]="null" [(ngModel)]="selected"></ti-tags-input>
<br /><br />
<h4>3.空数据[]:</h4>
<br />
<p>选中项： {{selected | json}}</p>
<ti-tags-input style="width: 500px" [id]="id" [suggestions]="[]" [(ngModel)]="selected"></ti-tags-input>
